1ykf

NADP-DEPENDENT ALCOHOL DEHYDROGENASE FROM THERMOANAEROBIUM BROCKII
(see also Tetrameric alcohol dehydrogenases)



Superposition of the structures of the wild-type apo-EhADH1 (colored lime, 1y9a) and the apo D275P-EhADH1 mutant (colored orange) (2oui). Pro275 and Asp275 are labeled red. Residues within a distance of 4 Å from the mutation are shown (names of monomers are in brackets). Replacing Asp275 with Pro significantly enhanced the thermal stability of EhADH1: ΔT1/260min = +9.3°C, ΔT1/2CD = +10°C. The reverse mutation in the thermophilic TbADH (1ykf; colored magenta ) - substitution of wt TbADH Pro275 with Asp (2nvb; colored cyan ) reduced the thermal stability of the enzyme: ΔT1/260min = -13.8°C, ΔT1/2CD = -18.8°C. Nitrogen and oxygen atoms are colored in CPK colors. Pro275 and Asp275 are labeled red (names of monomers are in brackets). These findings indicate that a single proline mutation is responsible for the significant differences in the thermal stability of ADHs, and show the importance of prolines in the protein stability. It was also shown that substitution by proline at the important positions could significantly stabilize the protein.

About this Structure
1YKF is a 4 chains structure with sequences from Thermoanaerobacter brockii. The January 2001 RCSB PDB Molecule of the Month feature on Alcohol Dehydrogenase by David S. Goodsell is 10.2210/rcsb_pdb/mom_2001_1. Full crystallographic information is available from OCA.

Reference
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